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SALE OF BUSINESS UNIT (DISCONTINUED OPERATIONS) - Summary of net gain on disposal of discontinued operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net cash proceeds   $ 0 $ 55,629  
Book value of MSRs sold   (25,979) (39,186)  
Net gain on disposal   1,003 13,302  
Banc Home Loan | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from the transaction   0 63,332 $ 63,054
Compensation expense related to the transaction   1,003 (4,000) (2,497)
Other transaction costs   0 (3,703) (3,431)
Net cash proceeds   1,003 55,629 57,126
Book value of certain assets sold $ (2,500) 0 (2,455) 0
Book value of MSRs sold $ (37,800) 0 (37,772) (37,772)
Goodwill   0 (2,100) 0
Net gain on disposal   $ 1,003 $ 13,302 $ 14,799